// SPDX-License-Identifier: GPL-2.0+
/*
* (C) Copyright 2001
* Denis Peter, MPL AG Switzerland
*
* Part of this source has been derived from the Linux USB
* project.
*/
#include <common.h>
#include <console.h>
#include <dm.h>
#include <errno.h>
#include <malloc.h>
#include <memalign.h>
#include <stdio_dev.h>
#include <asm/byteorder.h>
#include <usb.h>
/*
* If overwrite_console returns 1, the stdin, stderr and stdout
* are switched to the serial port, else the settings in the
* environment are used
*/
#ifdef CONFIG_SYS_CONSOLE_OVERWRITE_ROUTINE
extern int overwrite_console(void);
#else
int overwrite_console(void)
{
return 0;
}
#endif
/* Keyboard sampling rate */
#define REPEAT_RATE 40 /* 40msec -> 25cps */
#define REPEAT_DELAY 10 /* 10 x REPEAT_RATE = 400msec */
#define NUM_LOCK 0x53
#define CAPS_LOCK 0x39
#define SCROLL_LOCK 0x47
/* Modifier bits */
#define LEFT_CNTR (1 << 0)
#define LEFT_SHIFT (1 << 1)
#define LEFT_ALT (1 << 2)
#define LEFT_GUI (1 << 3)
#define RIGHT_CNTR (1 << 4)
#define RIGHT_SHIFT (1 << 5)
#define RIGHT_ALT (1 << 6)
#define RIGHT_GUI (1 << 7)
/* Size of the keyboard buffer */
#define USB_KBD_BUFFER_LEN 0x20
/* Device name */
#define DEVNAME "usbkbd"
/* Keyboard maps */
static const unsigned char usb_kbd_numkey[] = {
'1', '2', '3', '4', '5', '6', '7', '8', '9', '0',
'\r', 0x1b, '\b', '\t', ' ', '-', '=', '[', ']',
'\\', '#', ';', '\'', '`', ',', '.', '/'
};
static const unsigned char usb_kbd_numkey_shifted[] = {
'!', '@', '#', '$', '%', '^', '&', '*', '(', ')',
'\r', 0x1b, '\b', '\t', ' ', '_', '+', '{', '}',
'|', '~', ':', '"', '~', '<', '>', '?'
};
static const unsigned char usb_kbd_num_keypad[] = {
'/', '*', '-', '+', '\r',
'1', '2', '3', '4', '5', '6', '7', '8', '9', '0',
'.', 0, 0, 0, '='
};
/*
* map arrow keys to ^F/^B ^N/^P, can't really use the proper
* ANSI sequence for arrow keys because the queuing code breaks
* when a single keypress expands to 3 queue elements
*/
static const unsigned char usb_kbd_arrow[] = {
0x6, 0x2, 0xe, 0x10
};
/*
* NOTE: It's important for the NUM, CAPS, SCROLL-lock bits to be in this
* order. See usb_kbd_setled() function!
*/
#define USB_KBD_NUMLOCK (1 << 0)
#define USB_KBD_CAPSLOCK (1 << 1)
#define USB_KBD_SCROLLLOCK (1 << 2)
#define USB_KBD_CTRL (1 << 3)
#define USB_KBD_LEDMASK \
(USB_KBD_NUMLOCK | USB_KBD_CAPSLOCK | USB_KBD_SCROLLLOCK)
/*
* USB Keyboard reports are 8 bytes in boot protocol.
* Appendix B of HID Device Class Definition 1.11
*/
#define USB_KBD_BOOT_REPORT_SIZE 8
struct usb_kbd_pdata {
unsigned long intpipe;
int intpktsize;
int intinterval;
unsigned long last_report;
struct int_queue *intq;
uint32_t repeat_delay;
uint32_t usb_in_pointer;
uint32_t usb_out_pointer;
uint8_t usb_kbd_buffer[USB_KBD_BUFFER_LEN];
uint8_t *new;
uint8_t old[USB_KBD_BOOT_REPORT_SIZE];
uint8_t flags;
};
extern int __maybe_unused net_busy_flag;
/* The period of time between two calls of usb_kbd_testc(). */
static unsigned long __maybe_unused kbd_testc_tms;
/* Puts character in the queue and sets up the in and out pointer. */
static void usb_kbd_put_queue(struct usb_kbd_pdata *data, char c)
{
if (data->usb_in_pointer == USB_KBD_BUFFER_LEN - 1) {
/* Check for buffer full. */
if (data->usb_out_pointer == 0)
return;
data->usb_in_pointer = 0;
} else {
/* Check for buffer full. */
if (data->usb_in_pointer == data->usb_out_pointer - 1)
return;
data->usb_in_pointer++;
}
data->usb_kbd_buffer[data->usb_in_pointer] = c;
}
/*
* Set the LEDs. Since this is used in the irq routine, the control job is
* issued with a timeout of 0. This means, that the job is queued without
* waiting for job completion.
*/
static void usb_kbd_setled(struct usb_device *dev)
{
struct usb_interface *iface = &dev->config.if_desc[0];
struct usb_kbd_pdata *data = dev->privptr;
ALLOC_ALIGN_BUFFER(uint32_t, leds, 1, USB_DMA_MINALIGN);
*leds = data->flags & USB_KBD_LEDMASK;
usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
USB_REQ_SET_REPORT, USB_TYPE_CLASS | USB_RECIP_INTERFACE,
0x200, iface->desc.bInterfaceNumber, leds, 1, 0);
}
#define CAPITAL_MASK 0x20
/* Translate the scancode in ASCII */
static int usb_kbd_translate(struct usb_kbd_pdata *data, unsigned char scancode,
unsigned char modifier, int pressed)
{
uint8_t keycode = 0;
/* Key released */
if (pressed == 0) {
data->repeat_delay = 0;
return 0;
}
if (pressed == 2) {
data->repeat_delay++;
if (data->repeat_delay < REPEAT_DELAY)
return 0;
data->repeat_delay = REPEAT_DELAY;
}
/* Alphanumeric values */
if ((scancode > 3) && (scancode <= 0x1d)) {
keycode = scancode - 4 + 'a';
if (data->flags & USB_KBD_CAPSLOCK)
keycode &= ~CAPITAL_MASK;
if (modifier & (LEFT_SHIFT | RIGHT_SHIFT)) {
/* Handle CAPSLock + Shift pressed simultaneously */
if (keycode & CAPITAL_MASK)
keycode &= ~CAPITAL_MASK;
else
keycode |= CAPITAL_MASK;
}
}
if ((scancode > 0x1d) && (scancode < 0x39)) {
/* Shift pressed */
if (modifier & (LEFT_SHIFT | RIGHT_SHIFT))
keycode = usb_kbd_numkey_shifted[scancode - 0x1e];
else
keycode = usb_kbd_numkey[scancode - 0x1e];
}
/* Arrow keys */
if ((scancode >= 0x4f) && (scancode <= 0x52))
keycode = usb_kbd_arrow[scancode - 0x4f];
/* Numeric keypad */
if ((scancode >= 0x54) && (scancode <= 0x67))
keycode = usb_kbd_num_keypad[scancode - 0x54];
if (data->flags & USB_KBD_CTRL)
keycode = scancode - 0x3;
if (pressed == 1) {
if (scancode == NUM_LOCK) {
data->flags ^= USB_KBD_NUMLOCK;
return 1;
}
if (scancode == CAPS_LOCK) {
data->flags ^= USB_KBD_CAPSLOCK;
return 1;
}
if (scancode == SCROLL_LOCK) {
data->flags ^= USB_KBD_SCROLLLOCK;
return 1;
}
}
/* Report keycode if any */
if (keycode) {
debug("%c", keycode);
usb_kbd_put_queue(data, keycode);
}
return 0;
}
static uint32_t usb_kbd_service_key(struct usb_device *dev, int i, int up)
{
uint32_t res = 0;
struct usb_kbd_pdata *data = dev->privptr;
uint8_t *new;
uint8_t *old;
if (up) {
new = data->old;
old = data->new;
} else {
new = data->new;
old = data->old;
}
if ((old[i] > 3) &&
(memscan(new + 2, old[i], USB_KBD_BOOT_REPORT_SIZE - 2) ==
new + USB_KBD_BOOT_REPORT_SIZE)) {
res |= usb_kbd_translate(data, old[i], data->new[0], up);
}
return res;
}
/* Interrupt service routine */
static int usb_kbd_irq_worker(struct usb_device *dev)
{
struct usb_kbd_pdata *data = dev->privptr;
int i, res = 0;
/* No combo key pressed */
if (data->new[0] == 0x00)
data->flags &= ~USB_KBD_CTRL;
/* Left or Right Ctrl pressed */
else if ((data->new[0] == LEFT_CNTR) || (data->new[0] == RIGHT_CNTR))
data->flags |= USB_KBD_CTRL;
for (i = 2; i < USB_KBD_BOOT_REPORT_SIZE; i++) {
res |= usb_kbd_service_key(dev, i, 0);
res |= usb_kbd_service_key(dev, i, 1);
}
/* Key is still pressed */
if ((data->new[2] > 3) && (data->old[2] == data->new[2]))
res |= usb_kbd_translate(data, data->new[2], data->new[0], 2);
if (res == 1)
usb_kbd_setled(dev);
memcpy(data->old, data->new, USB_KBD_BOOT_REPORT_SIZE);
return 1;
}
/* Keyboard interrupt handler */
static int usb_kbd_irq(struct usb_device *dev)
{
if ((dev->irq_status != 0) ||
(dev->irq_act_len != USB_KBD_BOOT_REPORT_SIZE)) {
debug("USB KBD: Error %lX, len %d\n",
dev->irq_status, dev->irq_act_len);
return 1;
}
return usb_kbd_irq_worker(dev);
}
/* Interrupt polling */
static inline void usb_kbd_poll_for_event(struct usb_device *dev)
{
#if defined(CONFIG_SYS_USB_EVENT_POLL)
struct usb_kbd_pdata *data = dev->privptr;
/* Submit a interrupt transfer request */
usb_submit_int_msg(dev, data->intpipe, &data->new[0], data->intpktsize,
data->intinterval);
usb_kbd_irq_worker(dev);
#elif defined(CONFIG_SYS_USB_EVENT_POLL_VIA_CONTROL_EP) || \
defined(CONFIG_SYS_USB_EVENT_POLL_VIA_INT_QUEUE)
#if defined(CONFIG_SYS_USB_EVENT_POLL_VIA_CONTROL_EP)
struct usb_interface *iface;
struct usb_kbd_pdata *data = dev->privptr;
iface = &dev->config.if_desc[0];
usb_get_report(dev, iface->desc.bInterfaceNumber,
1, 0, data->new, USB_KBD_BOOT_REPORT_SIZE);
if (memcmp(data->old, data->new, USB_KBD_BOOT_REPORT_SIZE)) {
usb_kbd_irq_worker(dev);
#else
struct usb_kbd_pdata *data = dev->privptr;
if (poll_int_queue(dev, data->intq)) {
usb_kbd_irq_worker(dev);
/* We've consumed all queued int packets, create new */
destroy_int_queue(dev, data->intq);
data->intq = create_int_queue(dev, data->intpipe, 1,
USB_KBD_BOOT_REPORT_SIZE, data->new,
data->intinterval);
#endif
data->last_report = get_timer(0);
/* Repeat last usb hid report every REPEAT_RATE ms for keyrepeat */
} else if (data->last_report != -1 &&
get_timer(data->last_report) > REPEAT_RATE) {
usb_kbd_irq_worker(dev);
data->last_report = get_timer(0);
}
#endif
}
/* test if a character is in the queue */
static int usb_kbd_testc(struct stdio_dev *sdev)
{
struct stdio_dev *dev;
struct usb_device *usb_kbd_dev;
struct usb_kbd_pdata *data;
#ifdef CONFIG_CMD_NET
/*
* If net_busy_flag is 1, NET transfer is running,
* then we check key-pressed every second (first check may be
* less than 1 second) to improve TFTP booting performance.
*/
if (net_busy_flag && (get_timer(kbd_testc_tms) < CONFIG_SYS_HZ))
return 0;
kbd_testc_tms = get_timer(0);
#endif
dev = stdio_get_by_name(DEVNAME);
usb_kbd_dev = (struct usb_device *)dev->priv;
data = usb_kbd_dev->privptr;
usb_kbd_poll_for_event(usb_kbd_dev);
return !(data->usb_in_pointer == data->usb_out_pointer);
}
/* gets the character from the queue */
static int usb_kbd_getc(struct stdio_dev *sdev)
{
struct stdio_dev *dev;
struct usb_device *usb_kbd_dev;
struct usb_kbd_pdata *data;
dev = stdio_get_by_name(DEVNAME);
usb_kbd_dev = (struct usb_device *)dev->priv;
data = usb_kbd_dev->privptr;
while (data->usb_in_pointer == data->usb_out_pointer)
usb_kbd_poll_for_event(usb_kbd_dev);
if (data->usb_out_pointer == USB_KBD_BUFFER_LEN - 1)
data->usb_out_pointer = 0;
else
data->usb_out_pointer++;
return data->usb_kbd_buffer[data->usb_out_pointer];
}
/* probes the USB device dev for keyboard type. */
static int usb_kbd_probe_dev(struct usb_device *dev, unsigned int ifnum)
{
struct usb_interface *iface;
struct usb_endpoint_descriptor *ep;
struct usb_kbd_pdata *data;
if (dev->descriptor.bNumConfigurations != 1)
return 0;
iface = &dev->config.if_desc[ifnum];
if (iface->desc.bInterfaceClass != USB_CLASS_HID)
return 0;
if (iface->desc.bInterfaceSubClass != USB_SUB_HID_BOOT)
return 0;
if (iface->desc.bInterfaceProtocol != USB_PROT_HID_KEYBOARD)
return 0;
if (iface->desc.bNumEndpoints != 1)
return 0;
ep = &iface->ep_desc[0];
/* Check if endpoint 1 is interrupt endpoint */
if (!(ep->bEndpointAddress & 0x80))
return 0;
if ((ep->bmAttributes & 3) != 3)
return 0;
debug("USB KBD: found set protocol...\n");
data = malloc(sizeof(struct usb_kbd_pdata));
if (!data) {
printf("USB KBD: Error allocating private data\n");
return 0;
}
/* Clear private data */
memset(data, 0, sizeof(struct usb_kbd_pdata));
/* allocate input buffer aligned and sized to USB DMA alignment */
data->new = memalign(USB_DMA_MINALIGN,
roundup(USB_KBD_BOOT_REPORT_SIZE, USB_DMA_MINALIGN));
/* Insert private data into USB device structure */
dev->privptr = data;
/* Set IRQ handler */
dev->irq_handle = usb_kbd_irq;
data->intpipe = usb_rcvintpipe(dev, ep->bEndpointAddress);
data->intpktsize = min(usb_maxpacket(dev, data->intpipe),
USB_KBD_BOOT_REPORT_SIZE);
data->intinterval = ep->bInterval;
data->last_report = -1;
/* We found a USB Keyboard, install it. */
usb_set_protocol(dev, iface->desc.bInterfaceNumber, 0);
debug("USB KBD: found set idle...\n");
#if !defined(CONFIG_SYS_USB_EVENT_POLL_VIA_CONTROL_EP) && \
!defined(CONFIG_SYS_USB_EVENT_POLL_VIA_INT_QUEUE)
usb_set_idle(dev, iface->desc.bInterfaceNumber, REPEAT_RATE / 4, 0);
#else
usb_set_idle(dev, iface->desc.bInterfaceNumber, 0, 0);
#endif
debug("USB KBD: enable interrupt pipe...\n");
#ifdef CONFIG_SYS_USB_EVENT_POLL_VIA_INT_QUEUE
data->intq = create_int_queue(dev, data->intpipe, 1,
USB_KBD_BOOT_REPORT_SIZE, data->new,
data->intinterval);
if (!data->intq) {
#elif defined(CONFIG_SYS_USB_EVENT_POLL_VIA_CONTROL_EP)
if (usb_get_report(dev, iface->desc.bInterfaceNumber,
1, 0, data->new, USB_KBD_BOOT_REPORT_SIZE) < 0) {
#else
if (usb_submit_int_msg(dev, data->intpipe, data->new, data->intpktsize,
data->intinterval) < 0) {
#endif
printf("Failed to get keyboard state from device %04x:%04x\n",
dev->descriptor.idVendor, dev->descriptor.idProduct);
/* Abort, we don't want to use that non-functional keyboard. */
return 0;
}
/* Success. */
return 1;
}
static int probe_usb_keyboard(struct usb_device *dev)
{
char *stdinname;
struct stdio_dev usb_kbd_dev;
int error;
/* Try probing the keyboard */
if (usb_kbd_probe_dev(dev, 0) != 1)
return -ENOENT;
/* Register the keyboard */
debug("USB KBD: register.\n");
memset(&usb_kbd_dev, 0, sizeof(struct stdio_dev));
strcpy(usb_kbd_dev.name, DEVNAME);
usb_kbd_dev.flags = DEV_FLAGS_INPUT;
usb_kbd_dev.getc = usb_kbd_getc;
usb_kbd_dev.tstc = usb_kbd_testc;
usb_kbd_dev.priv = (void *)dev;
error = stdio_register(&usb_kbd_dev);
if (error)
return error;
stdinname = env_get("stdin");
#if CONFIG_IS_ENABLED(CONSOLE_MUX)
error = iomux_doenv(stdin, stdinname);
if (error)
return error;
#else
/* Check if this is the standard input device. */
if (strcmp(stdinname, DEVNAME))
return 1;
/* Reassign the console */
if (overwrite_console())
return 1;
error = console_assign(stdin, DEVNAME);
if (error)
return error;
#endif
return 0;
}
#ifndef CONFIG_DM_USB
/* Search for keyboard and register it if found. */
int drv_usb_kbd_init(void)
{
int error, i;
debug("%s: Probing for keyboard\n", __func__);
/* Scan all USB Devices */
for (i = 0; i < USB_MAX_DEVICE; i++) {
struct usb_device *dev;
/* Get USB device. */
dev = usb_get_dev_index(i);
if (!dev)
break;
if (dev->devnum == -1)
continue;
error = probe_usb_keyboard(dev);
if (!error)
return 1;
if (error && error != -ENOENT)
return error;
}
/* No USB Keyboard found */
return -1;
}
/* Deregister the keyboard. */
int usb_kbd_deregister(int force)
{
#if CONFIG_IS_ENABLED(SYS_STDIO_DEREGISTER)
struct stdio_dev *dev;
struct usb_device *usb_kbd_dev;
struct usb_kbd_pdata *data;
dev = stdio_get_by_name(DEVNAME);
if (dev) {
usb_kbd_dev = (struct usb_device *)dev->priv;
data = usb_kbd_dev->privptr;
if (stdio_deregister_dev(dev, force) != 0)
return 1;
#if CONFIG_IS_ENABLED(CONSOLE_MUX)
if (iomux_doenv(stdin, env_get("stdin")) != 0)
return 1;
#endif
#ifdef CONFIG_SYS_USB_EVENT_POLL_VIA_INT_QUEUE
destroy_int_queue(usb_kbd_dev, data->intq);
#endif
free(data->new);
free(data);
}
return 0;
#else
return 1;
#endif
}
#endif
#ifdef CONFIG_DM_USB
static int usb_kbd_probe(struct udevice *dev)
{
struct usb_device *udev = dev_get_parent_priv(dev);
return probe_usb_keyboard(udev);
}
static int usb_kbd_remove(struct udevice *dev)
{
struct usb_device *udev = dev_get_parent_priv(dev);
struct usb_kbd_pdata *data;
struct stdio_dev *sdev;
int ret;
sdev = stdio_get_by_name(DEVNAME);
if (!sdev) {
ret = -ENXIO;
goto err;
}
data = udev->privptr;
if (stdio_deregister_dev(sdev, true)) {
ret = -EPERM;
goto err;
}
#if CONFIG_IS_ENABLED(CONSOLE_MUX)
if (iomux_doenv(stdin, env_get("stdin"))) {
ret = -ENOLINK;
goto err;
}
#endif
#ifdef CONFIG_SYS_USB_EVENT_POLL_VIA_INT_QUEUE
destroy_int_queue(udev, data->intq);
#endif
free(data->new);
free(data);
return 0;
err:
printf("%s: warning, ret=%d", __func__, ret);
return ret;
}
static const struct udevice_id usb_kbd_ids[] = {
{ .compatible = "usb-keyboard" },
{ }
};
U_BOOT_DRIVER(usb_kbd) = {
.name = "usb_kbd",
.id = UCLASS_KEYBOARD,
.of_match = usb_kbd_ids,
.probe = usb_kbd_probe,
.remove = usb_kbd_remove,
};
static const struct usb_device_id kbd_id_table[] = {
{
.match_flags = USB_DEVICE_ID_MATCH_INT_CLASS |
USB_DEVICE_ID_MATCH_INT_SUBCLASS |
USB_DEVICE_ID_MATCH_INT_PROTOCOL,
.bInterfaceClass = USB_CLASS_HID,
.bInterfaceSubClass = USB_SUB_HID_BOOT,
.bInterfaceProtocol = USB_PROT_HID_KEYBOARD,
},
{ } /* Terminating entry */
};
U_BOOT_USB_DEVICE(usb_kbd, kbd_id_table);
#endif